Try to manual start winvnc.exe ( while service isn't running".
Do get some warning popup " internet downloaded file"...
In that case, the file is market as unsecure (ntfs security)
You need to copy the file to a usb stick (FAT) and back to remove this
bit.

It took me a couple of days to revisit the site where the SBS 2008 x64 box is located (since I can't connect via VNC now - LOL)...

1. All upgrades to v1.0.9.5/v1.0.9.6 of UltraVNC were done by downloading/running the upgrade.exe over an existing/working v1.0.8.2 installation.
2. UAC is ON.
3. UltraVNC Server IS running as a service.
4. The old CAD.EXE file is still present, although I have tried renaming it to CADOLD.EXE and restarting the service (no change in behavior). Currently exists as CAD.EXE.

It appears the new approach is for v1.0.9.5+ to use the Microsoft SAS.DLL library - I have searched the entire C: drive of my SBS 2008 x64 machine, but this file does not exist. (The MSDN documentation referenced above says it does not ship with this version of Windows.) Is this file actually distributed/installed with the UltraVNC upgrade? Is this something I need to manually copy/register seperately?

Thanks Rudi, I'll download and give this a try when I return to that site later this week. (Yes, SBS 2008 is based on Vista/Server 2008 R1 code, whereas the newer SBS 2011 is based on Win7/Server 2008 R2 code.) I'm assuming I'll also have to regsvr this DLL file.

Just a thought: you might want to correct and update ALL of the v1.0.9.6 installers (both x86 and x64, full setup and update packages), as the MSDN documentation states that the SAS.DLL file is only natively available on Win 7/Server 2008 R2. This would mean that the file needs to be added to any Vista/Server 2008 R1 machine, x86 or x64 versions.

Unfortunately, I'm still having the same issue with my Windows 7 x64 workstation - any more ideas?

That's weird; thanks Rudi. I haven't touched my setup in months, but I was having terrible redisplay problems today -- I had to keep refreshing. Checking full screen under polling options helped. (And I'm back on 1.0.8.0.)

I couldn't understand the first time I came to this post, 'cause I did not know what a UAC was, and where to set it !!Also there is a lot of other information, for which I did not need to fix my problem... Hence, the post I mention, which helped me find UAC setting and get my attention only to it. Also, the post I found mention about the group policy editor that could be called by another file name...

I wanted to post it here in case someone, like me, wanted a quick fix easy to follow for his 32 bits server...

On a Win 7 machine, you must have UAC on. Keep it on the default setting. Next, have the PC logged in and unlocked. Remote into it with Ultravnc. Hit the button to send ctl alt delete command. You will see 2 popup messages, one I think is the UAC prompt, the other asks if you want to let ultravnc make changes to the registry. Say yes to all the popups. Now hit the ctl alt delete button again and you'll see the Win 7 PC at the lock/switch user/logoff etc. screen. You can now send ctl alt delete commands to it whether it is locked/logged off or unlocked.

click the start button type gpedit.msc in the search bar on the left pane at the top computer configurationscroll to administrative templates then at the bottom of that windows components then scroll down to windows logon options then double click on the bottom one on the right hand panel disable or enable software secure attention sequencethen on the top left click on the enable button then on the scroll down bar under options click services then click apply at the bottom and close out